Tilted Forum Project Discussion Community - View Single Post - '96 Honda Accord: Is 89 octane gas OK to use?

shakran · 03-09-2006, 08:02 PM

That's a myth catback. 91 doesn't clean any better than 87. And in fact, it can foul things up if the car's not designed to run on it.

If the car's set up to run on 87, higher octane can leave incompletely burned fuel particles in the cylinders, aka carbon buildup. Do this long enough and you can actually cause the engine to start knocking on 87, because the carbon deposits stay hot after the gas ignites, and can preignite the gas in the next cycle. So while 89 won't kill your engine, it can get your engine hooked, so to speak, on 89, to the point where you'd HAVE to use it to prevent pinging.

03-09-2006, 08:02 PM	#7 (permalink)
shakran Tone.	That's a myth catback. 91 doesn't clean any better than 87. And in fact, it can foul things up if the car's not designed to run on it. If the car's set up to run on 87, higher octane can leave incompletely burned fuel particles in the cylinders, aka carbon buildup. Do this long enough and you can actually cause the engine to start knocking on 87, because the carbon deposits stay hot after the gas ignites, and can preignite the gas in the next cycle. So while 89 won't kill your engine, it can get your engine hooked, so to speak, on 89, to the point where you'd HAVE to use it to prevent pinging.